Maint enance of certain protected monumrnts

(l) The Govemment sh.rll maintain ever) monument which has been acquircd uoder scction 12 or in respect ol which any of the rights mentioned in section 5 have been acquired. (2) When the Government has assumed the guardian- ship of a monument undcr section 4, it shall, for the purpose of maintaining such monument have access to the monument at all reasonable times, by itsetf and b1,its agent, subordinates and workmcn, lbr the purpose of inspecting the monumcnt and for the purpose of bringing such materials and doing such acts as the Govern- ment may consider necessary or desirable for the mainten- ance thereof.